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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB401354(A)
申请公布日期
1933.11.13
申请号
GB19320013735
申请日期
1932.05.12
申请人
AUTOMATIC ELECTRIC COMPANY LIMITED
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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